Fix submit command usage

cmd/cmd_test.go

@@ -26,12 +26,14 @@ const cfgHomeKey = "EXERCISM_CONFIG_HOME"
 // test, call the command by calling Execute on the App.
 //
 // Example:
-// cmdTest := &CommandTest{
-// 	Cmd:    myCmd,
-// 	InitFn: initMyCmd,
-// 	Args:   []string{"fakeapp", "mycommand", "arg1", "--flag", "value"},
-// 	MockInteractiveResponse: "first-input\nsecond\n",
-// }
+//
+//	cmdTest := &CommandTest{
+//		Cmd:    myCmd,
+//		InitFn: initMyCmd,
+//		Args:   []string{"fakeapp", "mycommand", "arg1", "--flag", "value"},
+//		MockInteractiveResponse: "first-input\nsecond\n",
+//	}
+//
 // cmdTest.Setup(t)
 // defer cmdTest.Teardown(t)
 // ...

cmd/submit.go

@@ -19,12 +19,14 @@ import (
 
 // submitCmd lets people upload a solution to the website.
 var submitCmd = &cobra.Command{
-	Use:     "submit FILE1 [FILE2 ...]",
+	Use:     "submit [FILE1	 ...]",
 	Aliases: []string{"s"},
 	Short:   "Submit your solution to an exercise.",
 	Long: `Submit your solution to an Exercism exercise.
 
     Call the command with the list of files you want to submit.
+    If you omit the list of files, the CLI will attempt to submit
+    automatically the appropriate solution files for the exercise.
 `,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		cfg := config.NewConfig()